JP3621457B2 - Push button malfunction prevention device in wristwatch - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a malfunction prevention device for preventing malfunction of a push button in a wristwatch.
[0002]
[Prior art]
A wristwatch such as a diver watch is provided with push buttons for operating various functions of the watch. This push button may be pressed and malfunctioned due to bending of the wrist or contact with foreign matter. In particular, in a diver watch, a malfunction of a push button can be dangerous.
[0003]
For this reason, various devices for preventing the push button from malfunctioning have been proposed. For example, an apparatus disclosed in Japanese Patent Laid-Open No. 3-21892 is an example.
[0004]
[Problems to be solved by the invention]
In this prior art, since the pushbutton head and the spring for projecting the pushbutton head are arranged in series, the length in the axial direction becomes longer, and the pushbutton projects larger than the watch case. . Further, the stopper of the push button is provided inside the guide cylinder, and this arrangement also lengthens the guide cylinder and increases the amount of protrusion. In addition, the lock cylinder comes into contact with the outer end surface of the guide cylinder in the locked state, and therefore, the guide cylinder must protrude from the watch case. This also increases the amount of protrusion of the guide tube. For this reason, there are drawbacks such as the push button hits the wrist and gives damage, or is easily damaged by contact with an external foreign object.
[0005]
In view of the above-described drawbacks in the prior art, the present invention is intended to provide a malfunction prevention device that can reduce the protrusion height of a push button and can easily determine whether or not it is in a locked state.
[0006]
[Means for Solving the Problems]
A pushbutton malfunction prevention device for a wristwatch according to the present invention includes a guide cylinder that is inserted and fixed in a hole formed in a case case and has a protruding portion outside the case, and a switch operation that is slidably inserted into the guide cylinder. It has a push button having a protrusion, a lock cylinder screwed around the outer periphery of the push button, and a spring that urges the push button outward, and the outer periphery of the guide cylinder projecting outwardly has an irregular shape. The inner circumference of the head of the push button is slidably engaged with this portion, and the guide hole of the guide cylinder has a circular cross section, and at least one annular groove is provided in the switch operation projection, and the annular groove A push button having at least one O-ring is slidably engaged in the guide hole, and a cylindrical groove extending in the axial direction is formed in the head of the push button. The bottom of the groove and the guide tube A spring is provided between the outer edge of the head It is intended.
[0007]
[Action]
When the lock cylinder is screwed in until it hits the case body, the push button is locked and cannot be pushed.
[0008]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a cut-away side view showing the entire push button malfunction prevention device according to the present invention, FIG. 2 is a cross-sectional view of the push button, FIG. 3 is a view of the push button viewed from the inside, and FIG. 5 is a front view of the lock cylinder, FIG. 6 is a sectional view of the guide cylinder, and FIG. 7 is a front view of the guide cylinder.
[0009]
As shown in FIG. 1, a radial hole 2 is formed in a case 1 of a watch case, and a cylindrical portion 3a of a guide tube 3 is inserted into the hole 2 and is fixed to the case 1 by means of brazing or the like. As shown in FIGS. 6 and 7, the guide tube 3 has a guide hole 3b having a circular cross section, a case outer projecting head outer periphery having a hexagonal head 3c, and a taper inlet 3d.
[0010]
2 and 3, the push button 4 includes a head 4a, a cylindrical groove 4b extending in the head in the axial direction, an annular display groove 4c formed on the outer periphery of the head, and a switch protruding rearward. It has an operation projection 4d. The display groove 4c is colored red, yellow or the like, and can display a locked state as will be described later.
[0011]
A male screw 5 is cut on the outer periphery of the head 4a, and grooves 6 are formed on the inner periphery corresponding to the hexagonal shape of the head 3c of the guide tube 3 as shown in FIG. ing. The projection 4d is provided with two annular grooves 7, to which O-rings 13 are respectively engaged.
[0012]
As shown in FIGS. 4 and 5, the lock cylinder 8 has a cylindrical shape, and is provided with an internal thread 9 that engages with the external thread 5 of the head 4a on the inner periphery, and a large number of slip stoppers on the outer periphery of the tip. A notch 8a is formed.
[0013]
Next, assembly of the device of the present invention will be described. First, the lock cylinder 8 is screwed into the male screw 5 of the head 4a until the inner end face of the lock cylinder coincides with the inner end face of the head 4a as shown in FIG. Next, after the spring 10 is inserted into the groove 4 b of the push button 4, the switch operation protrusion 4 d is inserted into the guide hole 3 b of the guide tube 3. The inner circumferential groove 6 of the head 4a is engaged with the hexagonal head 3c of the guide tube 3 and pushed against the pressing force of the spring 10, and the snap ring 12 is engaged with the annular groove 11 formed in the protrusion 4d. At the same time, the push button 4 is prevented from coming off and the assembly is completed.
[0014]
In this state, the push button 4 is held at the protruding position by the spring 10, and a pushing stroke S is formed between the inner end surface of the head 4 a and the body 1. Further, when the lock cylinder 8 is rotated to place the push button 4 in the locked state, the push button 4 is engaged with the hexagonal head 3c of the guide cylinder 3, so that the lock cylinder 8 can be moved without rotating. ing.
[0015]
FIG. 1 shows that the head 4a can be pushed by the stroke S in an operable state. By the pushing, the protrusion 4d protrudes into the case, and a switch (not shown) can be operated.
[0016]
Next, as shown by a chain line in FIG. 1, the lock cylinder 8 is screwed in until its inner end surface comes into contact with the outer wall of the barrel 1. This is the locked state, and the push button 4 cannot be pushed in. In this state, the front end surface of the lock cylinder 8 moves inward from the display groove 4c as shown in the figure, and a colored portion appears to indicate that it is in a locked state, so that it can be confirmed that no malfunction occurs. ing.
[0017]
【The invention's effect】
As described above, according to the present invention, the outer periphery of the case outwardly projecting head of the guide tube has an irregular shape, and the inner periphery of the push button head is slidably engaged with this portion, and the guide hole of the guide tube Has a circular section, and is provided with at least one annular groove in the switch operating projection, and a push button having at least one O-ring disposed in the annular groove is slidably engaged in the guide hole. A cylindrical groove extending in the axial direction is formed in the head, a spring is provided between the bottom of the groove and the outer end surface of the head of the guide tube, and a snap ring is formed on the case inward protrusion of the switch operation protrusion. It is fixed and abuts against the inner end of the guide tube to prevent it from coming off, and the inner end of the lock tube abuts against the outer wall of the case barrel to lock the push button. The amount of protrusion can be reduced and the occurrence of damage or the like can be prevented. In addition, while having a simple structure, it is possible to reliably prevent malfunction of the push button. Furthermore, the colored portion of the annular display groove can be used to confirm whether or not the lock state is set, and forgetting the lock operation when the lock state needs to be kept can be prevented.
[Brief description of the drawings]
FIG. 1 is a cut side view showing an entire push button malfunction prevention device according to the present invention.
FIG. 2 is a cross-sectional view of a push button.
FIG. 3 is a view of a push button viewed from the inside.
FIG. 4 is a cross-sectional view of a lock cylinder.
FIG. 5 is a front view of a lock cylinder.
FIG. 6 is a cross-sectional view of a guide tube.
FIG. 7 is a front view of a guide tube.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Clock case trunk | drum 2 Hole 3 Guide cylinder 3a Tube part 3b Guide hole 3c Hexagon head 3d Taper inlet 4 Push button 4a Head 4b Cylindrical groove 4c Annular display groove 4d Switch operation protrusion 5 Male screw 6 Groove 7 Annular groove 8 Lock cylinder 8a Notch 9 Female thread 10 Spring 11 Annular groove 12 Snap ring 13 O-ring S Stroke

Claims (3)

A guide tube that is inserted and fixed in a hole formed in a case case body, and has a protruding portion outside the case; a push button that has a switch operation projection that is slidably inserted into the guide tube; and In a device having a lock cylinder screwed on the outer periphery and a spring for urging the push button outward, the outer periphery of the case projecting head of the guide cylinder has an irregular shape . The guide hole of the guide tube has a circular cross section, and at least one annular groove is provided in the switch operating projection, and at least one O-ring is provided in the annular groove. The button is slidably engaged in the guide hole, a cylindrical groove extending in the axial direction is formed in the head of the push button, and a spring is formed between the bottom of the groove and the outer end surface of the head of the guide cylinder. Device for preventing malfunction of pushbuttons in wristwatches . 2. The push button malfunction prevention device for a wristwatch according to claim 1, wherein a display groove is provided on an outer periphery of the push button head so that the display groove is exposed when the lock cylinder is locked. 3. The push button malfunction prevention device for a wristwatch according to claim 2, wherein the display groove is colored.

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